As I understood it, it's an ACPI configuration, more or less 'forced' by Microsoft, to ensure this cool new S0 is the default. See [0] [1] and [2]. The fix/work-around is to tell the kernel to not do that, and just use traditional S3 sleep.
Adding `mem_sleep_default=deep` to your kernel cmdline should fix it. Been doing this on my XPS13 for 3 years now and it's fine.
Dell has "fixed" that problem by disabling S3 sleep on certain laptops. Not even kidding, the ACPI tables don't have S3 sleep as an option and it's not even some matter of OSI string trickery either.
Adding `mem_sleep_default=deep` to your kernel cmdline should fix it. Been doing this on my XPS13 for 3 years now and it's fine.
[0] https://bugzilla.kernel.org/show_bug.cgi?id=199689
[1] https://www.dell.com/community/XPS/XPS-13-9370-battery-drain...
[2] https://www.reddit.com/r/Dell/comments/8b6eci/xp_13_9370_bat...